| 孙志峰,仇傲,刘西恩,李杰,罗博.随钻声波测井四极子发射换能器的设计*[J].,2023,42(4):756-763 |
| 随钻声波测井四极子发射换能器的设计* |
| The design of quadrupole transmitter transducer used in LWD acoustic logging |
| 投稿时间：2022-02-10 修订日期：2023-06-28 |
| 中文摘要: |
| 提出一种基于金属基片结构的随钻四极子发射换能器,其一阶弯曲模式可用于随钻四极子声源。利用有限元法对该换能器进行了设计分析,结果表明在5kHz附近存在一阶弯曲振动模态,其径向位移分布及发射电压级响应均优于单纯的瓦片状压电阵子,非常适合随钻四极子工作频率及声场的测量需求。针对一阶弯曲振动模态,数值模拟了几何尺寸对换能器性能参数的影响。换能器谐振频率随着陶瓷片厚度、陶瓷片高度、陶瓷片张开角度、金属基片厚度的增大而升高。最大发射电压级幅值随着陶瓷片高度、陶瓷片张开角、金属片厚度的增大而升高；随着陶瓷片厚度的增大,最大发射电压级幅值先升高后逐渐降低。金属基片采用铝片可以使换能器有较大的发射功率。数值模拟结果可以对随钻声波测井仪四极子发射换能器的设计起到良好的指导作用。 |
| 英文摘要: |
| This paper proposes a kind of LWD quadrupole transmitter transducer based on metal substrate structure, and its first-order flexural vibration mode can be used for the LWD quadrupole acoustic source. The finite element method is used to design and analyze the transducer. The results show that the first-order flexural vibration resonance frequency is about 5kHz, and its radial displacement distribution and emission voltage level response are better than arcuate shaped piezoelectric vibrator. This transducer’s resonance frequency and acoustic field characteristic are suitable for the measurement requirements of LWD quadrupole acoustic logging. For first-order flexural vibration mode, the influence of geometrical size on the performance parameters of the transducer is numerically simulated. The resonance frequency will rise as thickness, height, opening angle of ceramic plate, and thickness of metal substrate increase. The maximum emission voltage level will rise as height, opening angle of ceramic plate and thickness of metal substrate increase. When height of ceramic plate increases, maximum emission voltage level will increase first and then decrease gradually. The transducer has a larger transmitting power when metal substrate is aluminum. The numerical simulation results play a good guiding role in design of the quadrupole transmitter transducer of the acoustic logging while drilling tool. |
| DOI：10.11684/j.issn.1000-310X.2023.04.011 |
| 中文关键词: 金属基片，压电陶瓷片，四极子换能器，有限元，随钻声波 |
| 英文关键词: Metal substrate, Piezoelectric vibrator, Quadrupole transducer, Finite element method, LWD acoustic logging |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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